Valves and valve actuation – Fluid actuated or retarded – Flexible wall expansible chamber reciprocating valve actuator
Patent
1996-04-10
1998-06-09
Lee, Kevin
Valves and valve actuation
Fluid actuated or retarded
Flexible wall expansible chamber reciprocating valve actuator
251 636, 92117A, 92103F, F16K 31126
Patent
active
057623155
ABSTRACT:
An actuator for fluid control valves with a reversible power module having a stationary inner member and a coaxially aligned movable outer member coupled to the valve flow control element and slidably movable on the inner member. A chamber formed between respective ends of the members includes a preformed bladder. Pneumatic pressure applied to the bladder drives the movable member to actuate the valve in a first direction. A spring returns the movable member in the second direction. The preformed bladder is formed with two pieces including an interconnecting perimeter portion. During bladder actuation the bladder perimeter portion is displaced from the bladder inner diameter to the bladder outer diameter with the bladder material in tension to thereby prolong bladder life.
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Fisher Controls International Inc.
Lee Kevin
LandOfFree
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